Yarn, a package manager developed by Facebook in collaboration with Exponent, Google, and Tilde, quickly gained attention in the JavaScript community due to its ability to address several shortcomings of npm, such as speed and dependency management. Yarn's caching system reduces build times significantly, while its flat dependency structure and offline mode offer additional benefits over npm's nested structure. Promoted by well-known developers like Tom Occhino, Chris Pojer, Sebastian McKenzie, and Yehuda Katz, Yarn benefited from the backing of prominent figures in the open-source community, including Addy Osmani and Paul Irish. The open-source nature of Yarn, combined with its ease of installation and initial invitation for developer contributions, facilitated widespread adoption and engagement, leading to substantial activity on GitHub shortly after its release.